Malicious PDF — malware analysis report

Static analysis result for SHA-256 925e28847d04e313…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 08:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a2cc682fa765af7ef1034cabd7edd34 SHA-1: ea8e13fa512b29ff6592b4323db00b6cb6078ccb SHA-256: 925e28847d04e3134cf1ac976911bb816b56b919d7ab4ef986539a737de7df6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ratsimae.ee/media/contents/file/85321695629.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v8tq1r4rmk4so872d1a58aokg7/gewamurisososiga.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/em1kmodgle0eq03jr81k64j941/29348317288.pdfIn PDF document text
    • https://tempegaring.com/contents/files/29423459632.pdfIn PDF document text
    • http://zzweien.com/d/files/libipavege.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/fipugibosep.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ca013d93f46253c418a22a1d37b9db8c/58092742035.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/531c69772f598f9cdffa2ab87e86609d/69012177907.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//50020224667.pdfIn PDF document text
    • http://ttc-investco.com/img/files/81121655298.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/90473955564.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa8eb6b58001797bf9b990091deedc07/losolij.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/zenewepemibe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f38fe0ffd75d3e3c8672c7a98f8f9945/papupenukulusijalesase.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/14487626305.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/53453049615.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/4707199134.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160769ce198335---72076683866.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/83387716652.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/4257164859.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/balaxatadife.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/89079290822.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160961990233dc---52028688900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=factors+affecting+mutual+fund+investment+decisions+research+articles+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 11208 bytes
SHA-256: 586a0d570f7e7349d34b83759bf89b1bb2248f6089073310bf227685f7d4d151
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 17776 bytes
SHA-256: 21aeccb9763f9385d50cd15bae493590301ed7234d18acff409dd710e29fd1cc